The denominators for each activity are:
410 (Additional Flood Data): aSFHA, the area of the Special Flood Hazard Area (on the community's FIRM);
420 (Open Space Preservation): aRF, the total area of regulated floodplain within the community;
430 (Higher Regulatory Standards): aRF, the total area of regulated floodplain within the community;
440 (Flood Data Maintenance): aRF, the total area of regulated floodplain within the community;
450 (Stormwater Management): aW, the total area of watershed affecting the community.
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